Gas overrun prevention and control method for low-gas-occurrence high-strength mining working face

Abstract

The invention provides a low-gas-occurrence high-strength mining working face gas overrun prevention and control method. The method comprises the steps that coal seam gas content is reduced through coal seam gas injection displacement enhanced extraction, and working face gas emission is controlled through top plate directional long drilling and upper corner buried pipe combined extraction. The specific process is as follows: before recovery, bedding gas injection holes and extraction holes are constructed in the coal seam, gas with pressure higher than that of coal seam gas is injected into the coal body through the gas injection holes to displace and replace the coal seam gas, and the content of the coal seam gas is reduced to a greater extent; in the recovery process, a top plate trend directional long drill hole is constructed in the upper portion of an overlying rock caving zone, gas in a goaf is extracted, and gas emission of the goaf is reduced; meanwhile, pipe insertion extraction is conducted at the upper corner, and the gas concentration of the upper corner is reduced. By implementing the method, zero overrun of gas on the high-strength mining working face can be ensured, and safe and efficient mining is realized.

Description

technical field [0001] The invention relates to the technical field of mine gas prevention and control, in particular to a method for prevention and control of gas exceeding the limit in a low-gas occurrence and high-intensity mining working face. Background technique [0002] With the consolidation, mergers and reorganization of the coal industry, the super-large coal production bases in Shanbei, Shendong, Shanbei and other thick and extra-thick coal seam mining areas will dominate and will also be the focus of future intelligent mine construction. In this type of mining area, the coal seam gas is low and the coal seam is thick. During high-intensity mining and pressure, it is easy to have problems such as high gas gushing intensity and upper corner exceeding the limit. The efficient mining of intelligent working faces will also be restricted by it. The current coal seam pre-drainage and anti-permeability technical measures have defects such as large amount of drainage work...

AI Technical Summary

Problems solved by technology

The current coal seam pre-drainage and anti-permeability technical measures have defects such as large amount of drainage engineering, high cost investment, low drainage efficiency, and long compliance period for such low-gas mines, especially the gas migration power of the coal seam itself. Insufficient gas drainage and anti-reflection effects are difficult to play. It is urgent to develop a new gas control system and develop new regional efficient gas drainage technology and equipment for such mining areas based on the characteristics of coal seam gas occurrence and mining in such mining areas. Provide technical support for intelligent high-intensity mining of thick / extremely thick coal seams

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